Centrifugal switch for alternating-current motors.



T. KARGAU. v CENTRIPUGAL SWITCHv POR ALTBRNATING GURRENT`MOTORS.

AP'PLIGATION'PIL@ mlm. 1911.

1,013,780 AImfnfmrJam. 2, 1912.

' UNITED STATES PATENT OFFICE.

:rHEonoRE KARGAU, E WARREN, onro,l AssrGNoR To THE rEERLEss ELECTRIC COMPANY, 0E WARREN, onro, Av CORPORATION 0E oHIo.

CENTRIFUGAL SWITCH FOR ALTERNATING-CURRENT MOTORS.

Specification of Letters Patent.

Patented Jan. 2,1912.

Application led February 2, 1911. Serial'No. 606,148.v

To a-ZZ 'whom 'it may concern:

Be it known that I, THEoDoRE KARGAU, of Varren, in the county of Trumbull and State of Ohio, have invented certainnew and useful Improvements `in Centrifugal Switches for Alternating-Current. Motors; and I do hereby declare the following tc be a full, clear, and exact-description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.'

' The object of this invention is-to provide improved, simple and highly ellicient means for opening the circuit of the starting coils ofan alternating motor after the rotor has attained the desired velocity.

Briefly outlined, the invention, which is specially designed for Afan motors embodies brushes which are yieldingly held in. contact with the inner surfaces of segments of the commutator, .but which are themselves carried `'by the armature shaft, and these' brushes will, when the desired velocity has been attained, be moved inwardly toward the' axial center of the commutator by the A centrifugal action of weighted arms 'con-v nected to the brushes, and thus open the vcircuit of the starting coils, such brushes,

when the motor ceases to operate, being automatically moved outwardly into contact with the segments 'of the commutator. The invention will be hereinafter fully set forth and particularly pointed out in the claims.

' In the accompanying drawings, Figure l is a side elevation, with parts broken away, Fig. 2 is a section on line 2 2, Fig. l, with parts in dotted lines. Fig. 3 is a sectional view of a portion of the contact segments, 40 Fig. 4 is a detached perspective view of the brushes and their support. View of the portion of the contact segments shown in Fig. 3. I

Referring to the drawings,.1 designates two fixed contact members of-an alternating motor, suchmembers being shown in the form ofopposite semi-circular segments 2 which are secured to aplate 3 of insulating material, which-latter, in practice, is designed to be secured to the frame of the motor. I have'shown connected to the two fixed members the windings of a two pole motor, that is to say, two starting coils.

One'end of each of these coils'will be con-v nected to one of the segments 2, and at their.

Fig. 5 is a faceoth'er ends these coils will be connected to the line. Y

To-the r'otor, vconventionally indicated at 5, is secured. a'contact plate 6, and to this contact plate are riveted or otherwise secured two pins 7 which are parallel with the shaft of the rotor. l Upon these pins are pivotally mounted two brushes 8 which are designed to contact with the inner surfaces of the two segments. These brushes remain in contact with the segments when the motor is running at low speed, and are held in that position by suitable springs, but according to my invention, after a 'predetermined speed is attained these brushes are caused lto move inwardly, toward the axis of the supporting plate 6 and thus cut out the starting coils. The means shown for accomplishing this result consistsin providing the brushes 8 with hubs 9 which are 'loosely journaled on pins 7 and formingsuch hubs with outwardly extending arms 10 of greater weight than thebrushes, and to these arms 10 I connect springs l2, which latter lare also connected to the contact plate 6. The brushes are .held in engagement with the inner faces of the segment until'.

the desired speed of the motor has been obtained. At this point the arms l0 are thrown outwardly, under centrifugal action, and the brushes are disengaged from the stationaryinemlber of the switch, or, specifically, the segments.

Thus it will be seen that I have providedv 'extremely simple and highly eliicient means for opening the circuit through the starting coils of the motor after the rotor has attained the desired speed. f

I claim as 'my invention:

1. In a motor, the combination with the terminals of-starting coils, Xed segments with which they are connected, ancha rotor, of brushes arranged within the segments and designed to normallyv engage the inner surfaces thereof, such brushes being carried 'by the rotor, and-means for yieldingly holding the brushes in contact with the inner faces of the segments, and means for moving the brushes inwardly toward the axial center of the rotor and out of contact'with the segments when the desired speed has been attained.

2. In a motor, the combination with the terminals of starting coils, Hired segments with which such terminals are connected,

and a rotor, of a support carriedby there-` tor, brushes mounted on said support and `designated to normally engage the inner for moving them linwardlytoward the axial center of the rotor and out-of'eontaet with the segments when the desired speed has been attained.

In a motor, the combination with which such terminals are connected,

by suehrotor, pins projeting from said plate 'paralleli'ng the axis of the rotor,v

brushes having hubs mounted on said pins, said brushes being designed to normally eny i vattained.r with the terminals of starting coils, 'fixed segments fscribing witnesses. anda rotor, of a .connectingplate carried f gage the inner faces of Asaid Segments,-l

weighted arms extending outwardly from .said hubs, and springsl connecting said arms to said connecting plate, said arms being rotorand" out of engagement/ with the seg'- ments when the desired speed has Vbeen whereof; I have 'signed this In testimony presence of two 'subspeei'cation in'the THEODORE KAReAU. Witnesses: 'i

W. C. WARD, D. EsTABRooK. l 

